Process and apparatus for reuse of liquid effluents generated in the textile finishing, laundering, dyeing and stamping process

PROCESS AND APPARATUS FOR REUSE OF LIQUID EFFLUENTS GENERATED IN THE TEXTILE FINISHING, LAUNDERING, DYEING AND STAMPING PROCESS, a process for effluent treatment composed of E2 and E3, characterized by containing four main phases depending on the effluent category, which are:

• 1—Separation phase of effluents generated by the washer
• a. In this phase, E1 is initially disregarded.
• b. Effluents E2 and E3 are lead separately through stop valves, pipes and tanks to the treatment processes and are later blended.
• 2—E2 treatment phase
• c. This effluent containing Q2 and Q5 qualities is submitted to a 5-micron filtering process and stored in a tank, where it awaits the filtered E3 effluent.
• 3—E3 treatment phase
• d. This effluent with Q3 and Q4 qualities, too, is submitted to a 5-micron filtering process and sent to the same tank where the E2 effluent gets stored after the 5-micron filtering.
• 4—E2 and E3 blending phase
• e. In this phase, recirculation by centrifugal bomb is used to mix E2 and E3 effluents. This facilitates the degradation of residual free chlorine in E3 by residual bisulfite in E2.
• f. Analysis of residual free chlorine in E2 and E3 mixture.
• g. The mixture is sieved through a 5-micron active coal and 01-micron polypropylene filter and is then submitted to separation by membranes.
• h. The permeated solution obtained from this separation is stored in a tank to which sodium hypochlorite is added to maintain a 0.2 ppm residue (this value will be reviewed during pilotage).